SJC SIZE CHART...

HATS:

0-3 months fits heads up to 14"
3-6 months 14"-16"
6-12 months 16"-18"
12-18 months 18"-19"
18M-2T 19"-20"
3T/5T 20"-21.5"
Preteen 21.5-22"
Teen Adult Regular 22"-24"
Adult Large 24" and up 

Preemies sizes available: 1-2 pounds, 2-3 pounds,  and 4-5 pounds

BOOTIES:

Newborn – 3m (3.5”)
6m (4”)
9m (4.25”)
12m (4.5”)